Routing fuel lines ?

[HIIFLY]

How close is acceptable is it to rout fuel lines to the exhaust headers ???

1" 2" 3" this is using a Red Fire sleeve on the hoses .
Thanks to all who respond .

[David Paule]

As far away as you can get it. And put a heat shield in between.

After shut-down, they'll heat-soak and the fuel will vapor-lock. This makes for hard starting if you intend to restart shortly, such as after a fuel stop.

And even a double-layer of fire sleeve isn't enough to prevent this.

It's not an in-flight issue because at that point the fuel passing through the line cools it.

Dave